scholarly journals Prediction of Coal and Gas Outburst Risk in West No. 2 Mining Area of Weijiadi Coal Mine

2018 ◽  
Keyword(s):  
Coal Mine ◽  
Mining Area ◽  
Coal And Gas Outburst ◽  
Gas Outburst

Reasons and Control Countermeasures of Special Soft Coal Roadway Deformation in Liangbei Coal Mine

2013 ◽  
Vol 671-674 ◽  
pp. 1144-1149
Author(s):  
Le Tuan Cheng ◽  
Jia Lin Zhang ◽  
Zheng Sheng Zou ◽  
Qing Bo Li
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Mining Area ◽  
Gas Content ◽  
Deformation And Failure ◽  
Gas Outburst ◽  
Soft Coal ◽  
Coal Roadway ◽  
Roadway Stability ◽  
Roadway Deformation

B1 coal seam located at -550m level in Liangbei Coal Mine is a typical "three-soft" seam. The coal roadway with a depth of 610-750m lies under the critical softening depth of the roadway, and its support difficulty coefficient is 1.5-2.0. The coal has poor air permeability, high gas content and high gas pressure, so danger degree of the gas outburst is relatively strong. The coal seam was destroyed in a disastrous state by more than 100 boreholes for gas outburst prevention during the excavation. This results in the difficulty in the roadway support. Engineering geological characteristics of the coal roadway at 11 mining area are introduced. Based on the engineering geo-mechanics method, the reasons of deformation and failure of the coal roadway are analyzed. In view of problems in excavation and support, as well as the type of the coal roadway deformation mechanism, the borehole parameters are optimized for the gas outburst prevention, and bolt-net-cable coupling support with high convex steel-belt is used to control the coal roadway stability at 11 mining area. Practice shows that the effect is fine.

Prediction Technology of Coal and Gas Outburst in Xuandong Coal Mine

2011 ◽  
Vol 255-260 ◽  
pp. 3731-3734
Author(s):  
Sheng Shan Zhao ◽  
Wei Dong Pan ◽  
Xin Wang ◽  
Jia Dun Liu
Keyword(s):  
Coal Mine ◽  
Magmatic Rock ◽  
Coal And Gas Outburst ◽  
Gas Content ◽  
Burial Depth ◽  
Disaster Reduction ◽  
Geological Structures ◽  
Practical Situation ◽  
Gas Outburst ◽  
Geological Conditions

Based on the complicated geological conditions of coal seam in Xuandong Coal Mine, such as deep burial depth, high gas content, magmatic rock intrusion and so on, the distribution regularities of magmatic rock, gas and geological structures were analyzed and studied. Combining with the practical situation of the dynamic disaster and phenomenon during the mining, the dangerous zones of coal and gas outburst were predicted and regional divided. The research results would have certain significance of practical guide to the outburst prevention and disaster reduction.

scholarly journals Energy Action Mechanism of Coal and Gas Outburst Induced by Rockburst

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Wenqing Zhang ◽  
Chaomin Mu ◽  
Dengke Xu ◽  
Zhongqing Li
Keyword(s):  
Coal Mine ◽  
Split Hopkinson Pressure Bar ◽  
High Stress ◽  
Coal Mass ◽  
Coal And Gas Outburst ◽  
Energy Conditions ◽  
Hopkinson Pressure Bar ◽  
Action Mechanism ◽  
Gas Outburst ◽  
Study Results

The essence of both rockburst and coal and gas outburst lies in fast energy release. In order to explore the energy action mechanism of coal and gas outburst induced by rockburst in rockburst and coal and gas outburst combined mines, the split Hopkinson pressure bar (SHPB) experimental device was firstly used to conduct uniaxial impact failure test of coal specimens prone to outburst under different strain rates, and their energy dissipation laws under impact loading were obtained. Next, under the engineering background of coal and gas dynamic phenomena induced by rockburst with different intensities in Xinyi Coal Mine and Pingdingshan Coal Group No. 12 Colliery in Henan Province and Dingji Coal Mine of Huainan Mining Group in Anhui Province, experimental study results were combined with numerical simulation analysis to discuss the energy mechanism of coal and gas outburst induced by rockburst. The study results show that the outburst can be divided into two different processes—critical outburst and outburst—according to the evolution law of outburst energy, and the critical energy conditions for coal and gas outburst are proposed. The minimum destructive energy range for the critical outburst of coal mass is obtained as (5–10) × 104 J/m3. Under some low gas, high stress, or strong disturbance conditions, applied loads can become the main energy sources causing critical failure and even crushing and throwing of coal mass. The coal mass will present an interval splitting structure under dynamic loading, which is obviously different from the failure mode of coal mass under static actions.

scholarly journals Analysis of the Occurrence Mechanism for Coal and Gas Outburst Based on Multiple Discriminant Indices

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Hai Rong ◽  
Hongwei Zhang ◽  
Bing Liang ◽  
Weihua Song
Keyword(s):  
Coal Mine ◽  
Regional Distribution ◽  
Geological Structure ◽  
Coal And Gas Outburst ◽  
Prevention Measures ◽  
Distribution Law ◽  
Risk Levels ◽  
Gas Outburst ◽  
Prediction And Prevention ◽  
Occurrence Mechanism

In order to reveal the occurrence mechanism of coal and gas outburst and optimize the measures to prevent the disaster, a coal mine in Henan Province was undertaken as the research background. Based on the geological and mining conditions of the coal mine, the gas geological analysis method is applied to determine the outburst occurrence and to classify the risk levels. A multifactor pattern recognition method is used to determine the risk probability of the dynamic disasters such as coal and gas outburst. The relationship between geological structure, rock mass stress, and mine dynamic hazards is determined using geo-dynamic division method and FLAC3D numerical simulation. The occurrence and manifestation characteristics of the dynamic hazards are determined. COMSOL Multiphysics software is used to evaluate the original prevention measures and to optimize the measures. The research results determine the main influencing factors and regional distribution law of coal and gas outburst, which is of great significance to the risk prediction and prevention of dynamic disasters such as coal and gas outburst.

Features of Jianshanchong Klippe and its Control to Gas Geology at Qingshan Coal Mine, Jiangxi Province

2012 ◽  
Vol 164 ◽  
pp. 501-505
Author(s):  
Zhi Gen Zhao ◽  
Jia Chen ◽  
Jia Ping Yan
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Emission Rate ◽  
Coal And Gas Outburst ◽  
Jiangxi Province ◽  
Coal Seams ◽  
Gas Emission ◽  
Gas Outburst ◽  
Transverse Profile ◽  
Tectonic Coal

The coal and gas outburst is serious at Qingshan Coal Mine of Jiangxi Province, so it is of significance to research the features of Jianshanchong klippe and its control to gas geology. The research reveals that: Jianshanchong klippe is distributed from the east boundary of Qingshan Coal Mine to No. 45 Exploration Line, its transverse profile is like a funnel while its longitudinal profile is like a wedge, northwest side of the klippe is thicker and deeper while southeast side is thinner and more shallow. Because of the cover and insert of Jianshanchong klippe, the structure of coal-bearing strata is more complex, some secondary folds are formed, and also, the coal seam is changed greatly, the tectonic coal is well developed and the coal seam is suddenly thickening or thinning. Due to the effect of Jianshanchong klippe, the coal and gas outbursts occur in the area of secondary folds, thicker coal seams or tectonic coals. Concerning the prediction of gas geology in deep area, in view of the facts including simpler structure, stable coal seam and decreased thickness, the gas emission rate and the coal and gas outburst will decrease in Fifth and Sixth Mining Level than that in Second and Third Mining Level

The Preventing Coal and Gas Outburst Technology of Middle Distance and Low Permeability and Upper Protective Layer

2013 ◽  
Vol 690-693 ◽  
pp. 3059-3067 ◽  
Author(s):  
Guo Wei Dong
Keyword(s):  
Protective Layer ◽  
Mining Area ◽  
Coal And Gas Outburst ◽  
Low Permeability ◽  
Control Effect ◽  
Coal Seams ◽  
Gas Outburst ◽  
Protection Layer ◽  
And Control ◽  
Layer Control

Protective layer mining is the main regional measures for control coal and gas outburst . According to the defects of the preventing coal and gas outburst technology of middle distance and low permeability and upper protective layer in western Shuicheng mining area, the coal seams coal and gas outburst original danger are analyzed and protective layer is choosed initially using gas geological theory,the choice upper protective layer feasibility is analyzed using protection layer theory. the preventing coal and gas outburst technology of middle distance and low permeability and upper protective layer control effect is studied by numerical simulation and spot investigation. The conclusions from this research：the preventing coal and gas outburst technology of middle distance and low permeability and upper protective layer can decrease coal and gas outburst prediction index and control coal and gas outburst; the coal seams coal and gas outburst original danger can be preliminarily evaluated and the evaluation result can provide the basis for protective layer choice; the preventing coal and gas outburst technology of middle distance and low permeability and upper protective layer can be applied in western marine-continental transitional facies coal measure strata.

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